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Exchange Downtime Calculations - 2003 to 2010 over WAN

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  • Exchange Downtime Calculations - 2003 to 2010 over WAN

    Are there any guidelines on estimating the amount of downtime to expect when migrating mailboxes from Exchange 2003 to Exchange 2010 over a WAN link? We have a server with 400 mailboxes totaling 500 GB of data and are trying to estimate how long it will take to migrate that data over a T-1 connection. Are there any guidelines on calculating a rough estimate?

    Thank you

  • #2
    Re: Exchange Downtime Calculations - 2003 to 2010 over WAN

    On a T-1 line running at 1.544Mbps your 500GB download would take approxiamtely 32 Days 4 Hours 41 Minutes 54.57 Seconds

    http://www.t1shopper.com/tools/calcu...calculator.php

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    • #3
      Re: Exchange Downtime Calculations - 2003 to 2010 over WAN

      Originally posted by wullieb1 View Post
      On a T-1 line running at 1.544Mbps your 500GB download would take approxiamtely 32 Days 4 Hours 41 Minutes 54.57 Seconds
      Hello Wullieb1,

      There is no overhead that needs to be calculated in? We should be able to migrate the mailboxes at the full speed of the WAN link?

      Thank you

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      • #4
        Re: Exchange Downtime Calculations - 2003 to 2010 over WAN

        There will be overheads of a sort like the time it takes for the server to actually retrieve the details but the time shouldn't change by a huge margin.

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        • #5
          Re: Exchange Downtime Calculations - 2003 to 2010 over WAN

          Thank you. one other question... Does their reach a point of diminishing returns? I.e. if I have a 2xT1 connection between the two servers should I expect approximately twice the speed to migrate the mailboxes or 10 times the speed if I used a 15mbps wan link? I guess the question is does their reach a specfiic point where more bandwidth doesn't make things faster?

          Thanks!

          Comment


          • #6
            Re: Exchange Downtime Calculations - 2003 to 2010 over WAN

            Your overheads will be the other traffic running over the WAN link too

            Given the potential time involved, for a quick overall migration, have you considered taking the server offline for a weekend and shipping it to the other end of the WAN, then migrating at LAN speeds?

            Remember also you are migrating mailbox by mailbox, so individuals are off for approximately the size of their individual mailbox
            Given the numbers you quote, migrate say 10 users a night and few will notice much difference.
            Tom Jones
            MCT, MCSE (2000:Security & 2003), MCSA:Security & Messaging, MCDBA, MCDST, MCITP(EA, EMA, SA, EDA, ES, CS), MCTS, MCP, Sec+
            PhD, MSc, FIAP, MIITT
            IT Trainer / Consultant
            Ossian Ltd
            Scotland

            ** Remember to give credit where credit is due and leave reputation points where appropriate **

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            • #7
              Re: Exchange Downtime Calculations - 2003 to 2010 over WAN

              I have just done this with a client and we took six weeks to migrate the mailboxes. it was done in blocks of 10 - 15 overnight.

              Although I am in the early stages of planning to do this for another client, with more users with zero downtime.
              The plan with them is to put two temporary servers in the same location as the server, configured in a DAG. Move the mailboxes to the new environment and remove Exchange 2003. Then the passive member of the DAG pair will be lifted and removed to the real site. Once re-sync has taken place, the previously passive server will be made active. The previously active, now passive server will then be removed.

              Simon.
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              Simon Butler
              Exchange MVP

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